Observation window for furnaces



Nov. 4, 1941. i R L EERS 2,2s1,211

OBSERVATION WINDOW FOR F'URNACES Filed Jan. 22, 1940 INVENTOR. ROYCE L. BEERS ATTORNEYS Patented Nov. 4, 1941 w21-iii Royce L# Beers, Birmingham; Mich., assignor to Detroit Stoker Company, Monroe,Micl 1.,.a cor-` poration of Michigan Application January 22, 1940, Serial No. 315,102

3 Claims.

The invention relates to observation Windows for furnaces and consists in the novel construction as hereinafter set forth.

vIn the drawing:

Figure 1 is a front elevation of my improved observation window construction;

Figure 2 is a vertical central section therethrough;

Figure 3 is a horizontal section substantially on line 3 3, Figure l.

As illustrated, A is a casing having a portion B forming a lining for an opening through a furnace wall, a radially outwardly extending flange portion C for abutting against the front of said wall to be secured thereto by anchor bolts D, and a portion E projecting outward and forward of this flange in substantial alignment with the portion B. The opposite sides of the portion E are slotted near the upper ends thereof to form axially aligned segmental bearings F. Also, these opposite sides have inwardly projecting spaced lugs G and G. The bottom wall H is slightly raised above the level of the bottom of the portion B to form an inclined shoulder l and this bottom wall portion is slightly less in width than the side and top walls. J is a shutter provided with integral trunnions K and K for engaging and extending outward through the segmental bearings F in the side Walls of the portion E. One of these trunnions is provided with an upwardly extending crank arm L preferably terminating in an outwardly extending bell crank portion M. N is an annular front frame extending around the portion E and projecting inward therefrom. This frame bears against the sides of the portion E and is secured by bolts O which extend through the slots between the lugs G and G. Nuts P for the bolts are located in shouldered recesses Q in the rear portion of these lugs. The frame N is further provided with bearing segments R which extend into the slots in the side walls of the portion E and engage the trunnions K and K. 'Ihe frame N has a recess S in its inner face for receiving the colored glass T and a metallic screen U in rear thereof. These parts are retained in position by the lugs G and G', which. lugs also have inclined rear faces `forming bearings for the shutter J in the closed position thereof.

When the construction as described, the members A, J and N are preferably castings which can be easily assembled and secured by the bolts O and nuts P. Normally the shutter J will be heid by gravity in a. position to completely cut y(Cl. 126-200) glass T. Also, the slot V formed between the bottom wall of the portion E and the annular frame N, together with the slot W at the top formed by the recess S, permits of free air circulation through the chamber between the shutter and the glass. glass and the shutter which latter is located in the portion of the member A that is outside the furnace wall. Consequently, over-heating of the glass is effectively prevented. When observation is to be made the operator turns the crank L, preferably by drawing down a handle attached to the bell crank arm M which lifts the shutter J. As soon, however, as the handle is released, the shutter will automatically return to its normal position. The slot V in addition to forming an entrance aperture for the air, also permits the discharge of any ash or cinder that may iind its way into the chamber between the Vwith an operating crank arm, an annular front frame secured to said annular portion having complementary bearing segments extending into said open bearing slots and. retaining said trunnions therein, and a transparent panel mounted in said annular front frame.

2. An observation window for furnaces comprising a frame for mounting on a furnace wall in registration with an aperture therethrough, said frame having an inwardly extending annular portion for lining said` aperture, a radially extending flange for securing to the outer face of said wall and an annular portion extending outwardly from said flange the latter portion havingopen segmental bearings in the opposite sides thereof and having its bottom portion raised above the bottom of the portion lining said aperture to form an inclined shoulder therebetween, a shutter provided with oppositely extending trunnions at its upper end for engaging and extending 'through said open segmental bearings, one of said trunnions having an operating crank oif direct radiation of furnace heat against the arm at the outer end thereof, the lower edge This will cool both the f of said shutter normally resting against said inclined shoulder, an annular front frame abutting against said annular portion leaving open slots at both the bottom and top thereof. said front frame having complementary bearing segments for engaging said trunnions, lugs projecting inward from opposite sides of said annular portion with their outer surfaces flush with the outer surface of said portion and their inner surfaces forming abutments for said shutter, said lugs having slots therein and a shouldered recess in rear of each slot, bolts for securing said front frame to said annular portion extending through said slots and engaging nuts in said shouldered recesses, and a transparent panel secured between said annular front frame and said lugs.

3. An observation window for furnaces comprising a frame for mounting on a furnace wall and having an annular portion for registration with an aperture through said wall, a shutter tting within said annular portion provided with integral trunnions extending laterally and oppositely beyond the same, one of said trunnions being provided with an operating crank arm, an annular front frame secured to the aforesaid frame in registration with the annular portion thereof and together therewith retaining said trunnions and forming journal bearings therefor, and a transparent panel mounted in said annular front frame.

ROYCE L. BEERS. 

